Bismuth oxide micro-powder and its preparation method

Abstract

The invention discloses a bismuth oxide micro-powder and its preparation method which comprises, charging bismuth nitrate solution containing 100-350g / L of Bi 3+ into ammonium hydrogen carbonate solution with concentration of 10-25 wt%, controlling the weight ratio of charged ammonium and bismuth between 1.5-3.5, producing bismuth carbonate precipitate while agitating at normal temperature, filtering and washing, carrying out thermal treatment for the filter cake at 100-700 deg. C, thus obtaining the bismuth oxide product, dispersing agent 0.1-5 wt% of the ammonium hydrogen carbonate solution can be charged.

Description

Technical field

[0001] The invention belongs to the field of bismuth oxide for the electronics industry, and particularly relates to high-purity bismuth oxide doped in materials for preparing electronic components such as varistors, ceramic capacitors, dielectric ceramics, sensitive components, thermistors, arresters, and CRT glass bulbs Superfine powder and its preparation method. Background technique

[0002] As a doped material for electronic functional ceramics, bismuth oxide powder has high requirements for its chemical composition, but also has some special physical properties such as crystal structure, morphology, agglomeration state, particle size, particle size distribution, and specific surface area. Claim.

[0003] The existing bismuth oxide production methods include fire method and wet method. One of the pyrotechnic processes is to oxidize molten metal bismuth at high temperature in the presence of oxygen to produce bismuth oxide and then c...

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